Answer:
b.
Step-by-step explanation:
The given function is
Recall that the reciprocal of the cosine ratio is the secant ratio.
This implies that;
We take the inverse cosine of both sides to obtain;
Lengths in circles! Please get it right
1 answer:
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Let's say that the speed of the freight train is and the one of the passenger train is
.
MPH means every hour the freight train covers
miles., which means in 3h it will have covered 3 times as much:
mi.
Following the same logic, MPH means every hour the passenger train covers
miles, meaning after 3h it will have covered 3 times as much as well:
mi.
Now, having expressed those distances and speeds algebraically, we find the difference between the two distances covered after 3h, knowing it will be equal to 240:
Knowing this, we can surely affirm that the freight train is travelling at 40MPH and the passenger train is travelling three times as fast, 120MPH.